Mixed timing CPMG sequence for remotely positioned MRI
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United States of America Patent
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Jun 16, 1998
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N/A
app pub date -
May 31, 1996
filing date -
May 31, 1996
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Abstract
A method for maintaining encoded coherence for a remotely positioned MRI device is accomplished in groups of pulses. Each group includes four sequences of pulses and each sequence includes a tilting phase, an encoding phase and a recording phase. Specifically, each sequence begins with a 90.degree. tilting pulse. The encoding phase, which follows, is characterized by a time interval between refocusing 180.degree. pulses which is of sufficient duration to permit effective encoding of the material to be imaged. On the other hand, the recording phase, which follows the encoding phase, is characterized by a time interval between refocusing 180.degree. pulses which is shorter in duration in order to maintain encoded coherence during imaging. Within any group of pulses, there are four individually different sequences which result by shifting the phases of the refocusing pulses from sequence to sequence to provide 180.degree..sub..+-.x and 180.degree..sub..+-.y refocusing pulses.
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